Backing plate for abrasive flap wheels



FIG. 1 is a front perspective view of an ornamental design for a backing plate for an abrasive flap wheel showing my new design;

FIG. 2 is a top plan view; and,

FIG. 3 is a cross section.

The back side of the plate is not part of the claimed design. 

CLAIM The ornamental design for a backing plate for an abrasive flap wheel, as shown and described. 